This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 9 |
| 3 | 61 |
| 4 | 1121 |
| 5 | 13045 |
| 6 | 122641 |
| 7 | 1016471 |
| 8 | 38740403 |
| 9 | 5676677 |
| 10 | 272781835 |
| 11 | 3616405543 |
| 12 | 69929227909 |
| 13 | 2202505459051 |
| 14 | 149719228176481 |
| 15 | 151721190428485 |
| 16 | 1075152085921603 |
| 17 | 44585730010290731 |
| 18 | 1306775686290234751 |